Yup, these.Get one of those large black plastic concrete mixing tubs from somewhere like Home Depot. It fits perfectly in a CN and we use it for the bottom of our DCN. We sawed off the lips on the two shorter sides, but it will fit even if you dont' make any changes. It's plastic and is around 5" high on all sides. It works great! Not very expensive either.
I didn't know you could get them deeper. How deep did you get yours and how much was it + shipping?Those black bins can work well, unless you have chewers.
They were really expensive, but I love my Bass pans. I had the galvanized ones, but recently replaced them with the stainless steel and paid extra for additional depth. They're lighter and easier to clean and maintain, well worth it.